Function changedObjectDataFields

Returns the changed fields from A -> B. It's assumed that A and B have the same shape. ie. returns an object that only consists of fields which have changed in B compared to A.

const a = { msg: `hi`, v: 10 };

changedObjectDataFields(a, { msg: `hi`,   v: 10 }); // {}
changedObjectDataFields(a, { msg: `hi!!`, v: 10 }); // { msg: `hi!!` }
changedObjectDataFields(a, { msg: `hi!!` });       // { msg: `hi!!`, v: undefined }
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If B has additional or removed fields, this is considered an error.

If a field is an array, the whole array is returned, rather than a diff.